It Cosmetics - Celebration Foundation Illumination - full-coverage anti-aging foundation. This illuminating formula features the same ingredients you have come to know and love with original Celebration Foundation, but with the added element of illumination to add a subtle touch of radiance to your skin. 0.3-oz Celebration Foundation Illumination. How do I use it: Using a brush, gently swirl circles into powder, and then sweep gently onto skin in a circular motion to expertly distribute a natural look of illumination with a flawless, soft-focus, airbrushed-looking finish.